Improvement in lamp-chimneys



E. s. BLAKE.

Lamp Chimney. No. 35,866. Patented my 15, 1862.

N. PETERS, mmmwphu. wa-mngm n. c'

PATENT GFEICE.

E. S. BLAKE, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN LA'MP-CHIMNEYS.

Specification forming part of Letters Patent No. 35,866, dated July 15, 1802.

To all whom it may concern.-

Beit known that I, E. S. BLAKE', of Pittsburg, county of Allegheny, State of Pennsyl- Vania, have invented certain Improvements in the Construction of Lamp-Chimneys; and I do hereby declare t-hat the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My firstirnprovement consists in employing, to constitute in whole or in part the shaft of a lamp-chimney, several pieces of dat glass, any one of which, if` broken in use, may be replaced at small cost.

My second improvement in lamp-chimneys consists in providing the top of the shaft with a shield or cover to prevent the flame from being extinguished when the lamp is exposed to strong currents of air.

My lamp-chimney, when its shaft is made wholly of glass, is constructed as follows: The base upon which the shaft of the chimney rests consists of a metallic plate, A, Figure lv. (Shown separately in top view in Fig. 2, and in section, Fig. 3.) Through the center of this plate is a hole of the proper size and form for placing the plate in and securing it to the lamp-burner. The periphery of the plate is a figure having straight sides equal in number to the number of strips of glass I propose to use in forming the shaft ofthe chimney, and each of these sides is bounded by a deep groove, B.

Toform the shaft of the chimney, I cut from common window-glass or other liat plates of glass strips equal in length to the proposed height of the shaft and of width equal to the length of the vgroove (on each side of the plate) less the thickness of the glass employed. I insert the ends of the pieces of glass in the grooves in an alternate order,such that one edge of each piece rests against the side of an adjoining piece, as shown in horizontal section, Fig. 4. Thus a complete tubular inclosure is formed for the shaft, and each piece of glass aids in maintaining the upright posit-ion of another. The plate A is made of thin elastic metal, and the exterior walls of its grooves are turned in, so as to press upon the glass when inserted, and thus give it stability.

The strips of glass may be cut tapering, so that the shaft will converge to any required diameter at the top. To confine the strips of glass together at the top,I employ a band, C, of thin metal, with its upper edge turned inward to rest on the top of the glass, as shown in section, Fig. 5, or a metallic cup with a central opening may be employed for the purpose.

Fig. 6 shows my method of constructing the chimney when the lower partonly of the shaft is made of glass, the upper part being made of sheet-brass or other metal. In this case the strips of glass extend upward from the base to such height only as is required for a lateral diffusion of the light of the lamp, and are there held together by a plate, D, the edges of which are turned down, as shown in section, Fig. 7, to embrace the ends of the glass plates, or (the pieces of glass beingeheld to gether by a band, like 0, Figs. 1 and 5) the edges of the plate D may be turned inward and downward, so as to enter instead of embracing the glass part of the shaft, or the plate D may be provided with grooves to receive the glass, as in plate A. Into the central opening of this plate D is secured a metallic tube, E, to form the upper portionof the shaft.

My second improvement in lampehilnneys consists in providing the top of the shaft with a-shield or cover to prevent the flame from being extinguished when the lamp is used outof-doors or exposed to wind, the effect of the shield being to prevent a sudden and rapid current of air from descending the shaft, and thus extinguishing the light. This shield may be made and applied in any way in which it will serve to preventdirect currents down the shaft without too much impeding the upward draft of the shaft.

One of the forms in which the shield may be made and applied is shown in Figs. 8, 9, and l0. H is the shield, consisting of a conical shell of thin metal, the base of which is somewhat larger in diameter than the top of the shaft to which it is to be applied. This is supported by two or more wires or pillars extendingupward from the hoop or band K to such height as to al-low sufficient space between the band and shield for the escape of the heated air of the shaft'. Vhen applied to the chimney, the bend K is to embrace the upper end of the shaft.

I do not claim the making of the upper part of the shaft; of a lamp-chimney of metal; but

W'hat I do claim, end desire to secure by Letters Patent. is*

1. The mode herein described of construct` ing lamp-ohimneysthat is to say, making the shaft, in Whole or in part of several pieces of Het glass arranged :is herein described.

2. The base constructed to receive the lower ends of flat plates of glass, for the purposes above seb forth. 

